A Dubia cockroach (Blaptica dubia) that extrudes and retracts the ootheca. But what is it and why does it do that? The egg packets of cockroaches and mantises are called ootheca. The Dubia cockroach is ovoviviparous, meaning the eggs remain in the body until the young are ready to hatch. The extruding of the ootheca occurs because it's the only way to move them from the ovary chamber to the brood chamber.

I keep a small group of cockroaches because they are good food for my animals. The terrarium is set up with an 11 to 15 centimeter high layer of coconut soil, which is piled up like a slope towards the back wall of the terrarium. In the lower area there are branches, leaves and pieces of bark, where the animals stay the most. The upper area stays free, only the feeding bowl is there. I only keep the soil slightly moist in places. These areas are visited by the animals from time to time and also cover their drinking needs. Springtails and microorganisms also live in the soil, which help to keep the terrarium clean. It smells very good like forest floor.

Many startle when they hear the word cockroach. Only about 30 species out of 4,600 are associated with human habitats. In a normal living situation, there is no need to worry about an infestation by these animals.